Toner and preparation method thereof
AssigneeKonica Minolta Business Technologies, Inc.
InventorsKen OHMURA, Hiroshi YAMAZAKI, Tomomi OSHIBA
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Abstract
Disclosed is a toner comprising toner particles comprising a binding resin and a colorant, wherein the toner particles exhibit an average circularity of 0.950 to 0.980, a volume-base median diameter of 4.5 to 8.0 μm and a volume-based particle size dispersion degree (CVvol) of 15 to 25 and contain a metal element selected from the group consisting of titanium, germanium and aluminum in an amount of 10 to 1500 ppm. A manufacturing method of the toner is also disclosed.
Claims20
A toner comprising toner particles comprising a binding resin and a colorant, wherein the toner particles exhibit an average circularity of 0.950 to 0.980, a volume-based median diameter of 4.5 to 8.0 μm and a volume-based particle size dispersion degree (CVvol) of 15 to 25 and contain a metal element selected from the group consisting of titanium, germanium and aluminum in an amount of 10 to 1500 ppm.
A method of manufacturing a toner comprising toner particles comprising a polyester resin and a colorant, the method comprising the steps of:
- preparing a polyester segment,
- dispersing the polyester segment and the colorant in a solvent to form a solution containing the polyester segment and the colorant,
- dispersing the solution in an aqueous medium in the form of oil-droplets dispersed in the aqueous medium, and
- performing granulation from the oil-droplets to form the toner particles,
- wherein the polyester segment is prepared by polycondensing a polyol with a polycarboxylic acid in the presence of a metal ion selected from the group consisting of titanium, germanium and aluminum and the toner particles exhibit an average circularity of 0.950 to 0.980, a volume-based median diameter of 4.5 to 8.0 μm and a volume-based particle size dispersion degree (CVvol) of 15 to 25 and contain a metal element selected from the group consisting of titanium, germanium and aluminum in an amount of 10 to 1500 ppm.
Dependencies are inferred from the claim text.